I have an ozone pool, and use trichlor tablets, the CY level is way high and i am getting algae growth and no free chlorine and I guess I need to drain some water to fix. I also found Bio-Active that I thought about trying that but then thought will the ozone kill the microbes in that and render it useless? Pondered further to wonder is that bulb still good, it is 3 years old and maybe that it an issue ...how do I check a bulb it and I cant find it online either part is 9-1233-01 Hayward... Also think I might need to go to a different chlorine method but do not know how or what that looks like. Yea I am a mess.